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  1. #1


    Member Since
    Jan 28, 2007
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    11
    audio input buzz
    Hi All,

    I just got me a mac pro... love it except there is a buzz on the audio input line coming from my reciever. I am using the 1/8" audio input jack. Now on my old G4, the audio was fine (ie no buzz) with the same set up. Am I in need of an audio interface... say would an imic take care of this or is something else at work here? thanks

    R. Fink

  2. #2

    mac57's Avatar
    Member Since
    Apr 29, 2006
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    Specs:
    iMac 27" 3.4 GHz, 256 GB SSD, 2 TB HDD, 8 GB RAM
    Sounds like either a cable shielding issue or a grounding issue. Do you have another receiver, or any other audio source that you could hook up in place of your current receiver to try to isolate things?
    My Macs: iMac 27" 3.4 GHz, Mac Pro 3.2 GHz, PowerMac G5 Quad 2.5 GHz, G4 Cube with 1.2 GHz Upgrade
    My iStuff: 64GB iPhone 5, 64GB iPad4, 30GB iPod Video, 16GB iPod Touch
    My OS': Mac OS X Lion, Mac OS X Snow Leopard, Mac OS X Tiger, Mac OS 9.2.2, openSUSE 10.3
    I was on the Mac-Forums honor roll for September 2007

  3. #3


    Member Since
    Jan 28, 2007
    Posts
    11
    Quote Originally Posted by mac57 View Post
    Sounds like either a cable shielding issue or a grounding issue. Do you have another receiver, or any other audio source that you could hook up in place of your current receiver to try to isolate things?
    Yup, tried another reciever. Also hooked up the same system to my G4 and got no buzz. So this seems to be coming from the Mac Pro... from what I've been reading these machines seem to be pretty noisey, electrically speaking.

  4. #4

    mac57's Avatar
    Member Since
    Apr 29, 2006
    Location
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    Specs:
    iMac 27" 3.4 GHz, 256 GB SSD, 2 TB HDD, 8 GB RAM
    This is stretching a bit, but here are two other things to try, both related to ensuring you have a common ground:

    1/ Plug both systems into the same powerbar.

    2/ Use three pronged plugs for both - even better if they can both be into the same power bar.

    Good luck!
    My Macs: iMac 27" 3.4 GHz, Mac Pro 3.2 GHz, PowerMac G5 Quad 2.5 GHz, G4 Cube with 1.2 GHz Upgrade
    My iStuff: 64GB iPhone 5, 64GB iPad4, 30GB iPod Video, 16GB iPod Touch
    My OS': Mac OS X Lion, Mac OS X Snow Leopard, Mac OS X Tiger, Mac OS 9.2.2, openSUSE 10.3
    I was on the Mac-Forums honor roll for September 2007

  5. #5


    Member Since
    Jan 28, 2007
    Posts
    11
    Cool
    Thanks for the help... this was indeed a ground loop problem (I have said receiver and the computer in different rooms). A ground loop isolator (Xitel) on the input of the computer did the trick. FWIW. The imic worked as well but, attenuated the signal too much for my liking.

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